| MODEL | DUCATI 125 REGOLARITA 1975 - 1978 |
| Year | 1975 - 1978 |
| Engine Type | Two stroke, single cylinder, piston port |
| Displacement / Capacity | 123.7 cc / 7.5 cu in |
| Bore X Stroke | 54 x 54 mm |
| Compression Ratio | 10.5:1 |
| Cooling System | Air cooled |
| Max Power | 16.3 kW / 21.8 hp @ 9000 rpm |
| Max Torque | — |
| Ignition | 6V 75W flywheel magneto |
| Induction | Dell'Orto PHB30 carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 speed |
| Clutch | Wet, multiplate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | — |
| Front Suspension | Telescopic fork |
| Rear Suspension | Swingarm, dual shocks |
| Front Brakes | Drum, 125 mm |
| Rear Brakes | Drum, 140 mm |
| DIMENSION SPECS | |
| Overall Length | 2160 mm / 85.0 in |
| Overall Width | 920 mm / 36.2 in |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1420 mm / 55.9 in |
| Ground Clearance | — |
| Dry Weight | 108.8 kg / 240 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.00 x 21 |
| Rear Tyre | 3.75 x 18 |
| FUEL SYSTEM | |
| Fuel Capacity | 7.3 Litres / 1.9 US gal |
| Fuel Consumption | — |
| Top Speed | — |
Ducati's only large two-stroke, a clean-sheet 125 cc six-speed enduro built from 1975. It was aimed at trail and trials-style riders but sold poorly, with fewer than 3,500 made, roughly half going to France. It is now one of the rarer Ducatis, and led on to the lighter, stronger Six Days model.
